The dawn of the Golden Age of Aviation on planet Prester marks the era of vanship, retro-futuristic sky vehicles dominating the horizon. Born with the right stuff, Claus Valca and his navigator Lavie are fearless racers driven to become the first sky couriers to cross the Grand Stream. However, their adventure takes an unexpected turn when they meet a mysterious girl named Alvis, drawing them into the midst of an endless battle between Anatoray and Disith, two nations destroying each other according to chivalric warfare.
The episode starts with Tatiana who flies with her Vanship inside the Grand S...